I have a swap of 64 GB SSD. So is there a way to make /tmp mounted as tmpfs to use swap alone and not use RAM?
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4Sounds like too much work. Besides, tmpfs will automatically be swapped out if necessary, so you don't need to do anything. If this isn't sufficient, why not just put `/tmp` on the SSD? – Michael Hampton Aug 20 '15 at 04:51
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4Uhm... tmpfs entirely on swap is generally called "a disk partition". – womble Aug 20 '15 at 05:53
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@womble Actually not. That will also get cached in memory. – kasperd Aug 21 '15 at 08:32
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That is true. Not using RAM is actually rather tricky on a computer system... – womble Aug 21 '15 at 21:54
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I'm not quite clear what you're asking. tmpfs is an in-memory filesystem but you apparently don't want the contents of /tmp to actually reside in memory, is that right?
Then you simply don't use tmpfs and instead use an ordinary on-disk /tmp directory or dedicated partition with a normal file-system.
HBruijn
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2It might be added that even a mounted disk filesystem will take up some memory by using the block cache. – Tilman Schmidt Aug 20 '15 at 07:21